they come in 2 parts, the front face and the back part moulded to fit the bumper perfectly. I got the front face from ebay.com from a buyer in japan (£19 when i bought it, its about £28 now) to bolt my plate on with. You can get the part from lings honda (£36) too or any honda dealership with the part number i have at home. Its the same thing mo has used on the rear of his car
http://www.ebay.com/itm/JDM-GENUINE-HONDA-PLATE-HOLDER-CIVIC-DC2-PRELUDE-FIT-EF-/200755019158?pt=Motors_Car_Truck_Parts_Accessories&vxp=mtr&hash=item2ebdee7d96#ht_4568wt_1037